Effects of process parameters on the gelcasting green strength and sintered density of stainless steel
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摘要: 为了制备高坯体强度和烧结密度的凝胶注模成型不锈钢制件,研究了凝胶注模工艺参数包括预混液单体含量和单体/交联剂比例、浆料固相含量及引发剂加入量等对坯体抗弯强度及烧结体密度的影响规律.结果表明,对于316L不锈钢的凝胶注模成型,可同时获得较好的坯体强度和烧结密度的工艺条件为:预混液单体质量分数18%~22%,单体/交联剂比例90∶1~240∶1;浆料固相体积分数52%~55%;引发剂用量约为单体质量的0.8%~1.4%.最终获得坯体强度高于30.0MPa、烧结密度高于97%的复杂形状烧结不锈钢零件,其烧结体力学性能略低于粉末注射成型时的性能,但远高于美国MPIF标准.Abstract: An approach for fabricating sintered stainless steel with high green strength and sintered density by gelcasting was presented. The effects of gelcasting process parameters such as monomer content, ratio of monomer/cross-linker in premixed solution, solid loading of slurry, and initiator content on the green strength and sintered density of stainless steel were investigated. The results show that the appropriate process parameters of 316L stainless steel gelcasting are as follows, monomer mass fraction 18%-22%, ratio of monomer/cross-linker 90:1-240:1, solid loading 52%-55%, and initiator content 0.8%-1.4% (based on the mass of monomer). Under the above condition, complex-shaped stainless steel parts with green strength more than 30.0 MPa, sintered density more than 97% and mechanical properties slightly less than those of parts by metal powder injection molding (MIM) were obtained.
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Keywords:
- 316L stainless steel /
- gelcasting /
- complex-shape /
- green strength /
- sintered density
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